Comparing/Converting microphone dB-s to hearing dB-s

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Comparing/Converting microphone dB-s to hearing dB-s

Postby IsmajlMaliqi » Sat Sep 12, 2015 11:44 am

Hi,

I'm new to acoustics and I want to know if there is a formula regarding of comparing
recorded dB(decibels) from microphone that is from negative values to zero, around (-47dB that is almost quite) to 0dB that is almost the highest level with default (normal) hearing dB-s like dB on the restaurants around 60 dB.

To be clear is there a formula that convert this range (-47dB -0dB) to hearing dB (positive dB-s).



Thank you!
IsmajlMaliqi
 
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Re: Comparing/Converting microphone dB-s to hearing dB-s

Postby drnelson » Mon Sep 14, 2015 4:24 am

Most dB levels are relative. dBspl is an absolute acoustical measurement. dBfs is a maximum digital recording level.

From the specifications of an AKG C-414

Audio Frequency bandwidth 20 to 20000 Hz
Sensitivity 23 mV/Pa
Equivalent Noise Level 6 dB-A
Signal to Noise 88 dB-A

one pascal = 94dBspl

so the microphone would be outputting 23 mV at 94dBspl which would be -30.55dBu at Reference: 0.775 V
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Re: Comparing/Converting microphone dB-s to hearing dB-s

Postby IsmajlMaliqi » Mon Sep 14, 2015 1:23 pm

As I see there is no formula that specifically determine the conversion or comparing between two different dB-s (Microphone dB to Human hearing dB)!?
IsmajlMaliqi
 
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